Phonic diaphragm



Oct. 2 .1926.

J. L- FEARING PHONIG DIAPHRAGM Filed August 29 1923 Patented Oct. 26, 1926.

' UNITED sTAT -s USTIN L1 BEARING, or JAMAICA, NEW YORK, ASSIGNOR TO wnsrnmr ELECTRIC com- PATENT70FFICE.

IPANY, INCORPORATED, OF YORK, N. Y., A CORPORATION OF NEW YORK.

' PHONIC DIAPHRAGM.

Application" filed August 29, 1923. Serial No. 656,876.

This invention relates to phonic diaphragms, particularly to the direct acting Y typeyand has for an object to simplify the association of the diaphragm with respect to its driving means.

This is accomplished by providing a direct acting diaphragm with means which wholly or partly support the device which drives or actuates it.

' phonic diaphragm 1 is illustrated as a cone For further details of the invention, reference may be made to the drawings in which Fig. 1 is. a side elevation. partly in section of one form of the invention. Fig. 2 is a plan View of the conical diaphragm shown in Fig. 1. Fig. 3 is a detailed view of the means for supporting the actuating device. Fig. 4 is a side elevation partly in section with a modification.

" Referring in detail to the drawings, the

of paper, mica or bristol board or the like. The periphery of this cone may be-reenforced if desired, by means of the integralcorrugation 2. This cone is adapted to rest directly on the fabric 3 .which may be a floor carpet, a table cover or the like. Adjacent the apex of the cone is fastened the support.

17 which may be of sheet metal. and tripodal in form. The three legs of this support are bent near their extremities to an angle to conform to that of the cone and are apertured and fastened to the cone by suitable means such as the screw bolt 4. -Each of the legs of the support 17 is bent to forma threepoint support for the telephone diaphragm 5 of magnetic material. Resting on the diaphragm 5 is a ,telephonereceiver casing 6 which is of a smaller diameter than that of the diaphragm-5. The casing 6 contains 'elect-romagnets', the circuit of which may be.

;'connected to any suitable source of electric telephone currents. In order to obtain a tension in the phonic diaphragm 1., a weight 7,

the value of which can be determined by trial, is placed on the receiver casing 6.

In the modification shown in Fig. 4, cone 1 and fabric 3 are supported on a platform 8. to which is suitably fastened by means such as screws 9, the yoke 10 which carries means to provide a suitable tension in the phonic diaphragm 1 as well as means to suitably tension the telephone diaphragm 5. To this end the diaphragm 5 has its periphery engaged between yieldable material 11 carried in a plurality of pockets in the casing 12. By turning the screw .13 which is screw threaded in the top of the casing 12 and which bears on the top of the telephone casing 6, the distance between the diaphragm 5 and the pole pieces 14 may be adjusted. The screw 16 is screw threaded in the yoke 10 which carries a spring 15, one end of which bears on the top of the casing 12. By

turning the screw 16, the .tension in the phonic diaphragm 1 may be regulated.

The invention provides a large direct acting diaphragm ofthe inertia type, that is the diaphragm wholly or partly supports the telephone instrument.

The conical diaphragmniay be of the order of 14 to 18 inches in diameter and 3 to 4 inches high.

VVh'at is claimed is:

1; A large direct-acting conical diaphragmadapted for horizontal mounting, and means disposed at the apex of said diaphragm for supporting a telephone receiver, said means having a plurality of points in a plane parallel to the base of said diaphragm- JUSTIN FEARING. 

